Apparatus for molding pipe



Oct. 3, 1933. E. F. STRATTON APPARATUS FOR MOLDING PIPE Oct. 3, 1933. E. FL STRATTQN 1,929,336

APPARATUS FOR MOLDING PIPE Filed April 8, 1933 2 Sheets-Sheet 2 Thisinvention relates to new. and useful im -f provernents in molding apparatusand has par:

ticular relation to molds of'apermanent character especially designed .to. b'e...used. in. casting iron or other 'metallic piping'. i" The principal object of t the. invention i is' to provide molding apparatus of the general character set 'forth having a. mold provided with novel-'meahsfor-centering a core spindle'within said mold. Another'object of .the invention is to'provide molding apparatus ofthe generalcharacter set forth. having a core spindle providedwithgrooves on the surface thereof .to insure. adhesion of the customary silica sand core surface thereto.

' Anotherxobject of the invention is to provide molding. apparatus of the general character. set: forth which is of simple constructionyetstr'ong and durable and highly practical from the standpoint of manufacture and use. I I A more. specific object of the invention is to provide molding apparatus of the general char acter set forth wherein pipe or other structures may be cast and subsequently used without spe cial cleaning or other finishing operations.

Certain other features and details of the in vention are disclosed hereinafter and shown in the accompanying drawings, in which: I

Figure 1 is a view in elevation of the mold contemplated by the present invention;

Fig. 2 is a view in plan of the disclosure in Fig. l;

Fig. 3 is an end elevation of the disclosure in Fig. l; and I V Fig. 4 is a view in section on line 44, Fig. 3. It is generally known that in casting pipe and like structures and it is desirable to use perrnanent molds of metal by reason of the fact that castings made therein are of inherently greater tensile and crushing strength than can be producedin'the ordinary sand or other destructible molds.

Referring now more particularly to the draw 1 respectively which are of substantially semi-annular cross section shape having bell, and spigot molds 3 and 4 at its opposite ends. In'the present instance the'sections of the mold are'pivotally connected to each other at their lower edges by means of hinges 5and suitable look-- B respectively.

frece'ssesfof different configuration are formed intheabutting surfaces ,atpthe top of each mold section land 2 and are suitablyipositioned longitudinally thereof so that when t lde-flask is closed, each recess in theidrag seotion'z will',co-

operate. with a corresponding recess-in the cope l'to form'pouring gates and-gas vents land ,zThe .dragsectiony of theLmOld-LA is. perma' 'nently secured in-supporting cradles '9' which 5 extend" rearwardly below said. mold sectionqand are provided with upstanding supports :or braoka et' portions l0.';; -,A pu1ley,11 is. rotatably journaled at the'upperend of eachzof the upstanding brackets-.101 and thisipulley;isrgrooved; as 7 at 12 to receivev a rope or other pull.mean s -13. Thetforward end;,of-1the. pull. means 13 is; seecured to. an eye boltor. othersimilar: means 14 mounted; on :the copiesectioml of the mold adjacent the upperlongitudinal ,edge'of' the -lat ter, and 'the opposite end of said pull means has a counter weight 15 attached thereto; the) purpose for which will be set forth hereinafter. The customary core is provided and comprises a hollow spindle 16 having a peripheral layer or. 0

covering of silica sand or other equally suitable v material 1'7. In the present instance and in order that the layer ofsilica sand will better adhere-to the periphery of the spindle 16, the surface of the latter is provided with-a series of helical grooves s5 18, each of which intercept another of said grooves J at a plurality of pointsthr'oughout the length of the spindle. It will be obvious that th e grooves 18 formedon the surface of the spindle 16 will be filled with silica sand asshown'in Fig.- 4 of 9 0 the drawings, and key the layer or covering securely on the spindle. A plurality of vents 19 extend radially through the hollow spindle 16-at each junction of thehelical grooves 18 so that gases accumulating at the inner side of the pipe p or like article being'oa'st, mayescape through the pores in the layer of silica sand and the vents 19 to the interior of the spindle 16 which is open at itsends to the atmosphere. Inuse, the spindle, or tube 16 is coatedwith silica sand until the core is of proper diameter'and shape, and the core is then baked before, placing the-latter in the flask.

In the present instance the core B is supported in the moldby means of asbestosrings .20 which s are mounted'in undercut grooves 21 formed circumferentially in the inner wall, of the mold between each end of the flask cavity and the adjacent ends of said mold. As will be noticed by referring to Fig. 4 of the drawinga'clearance is no 7 provided-between the end surfaces of the core i of the gates 7; r

With the core B thus positioned within the mold- A and the locking devices 6 clamped to secure the spindle 16 and the surrounding end portions of the mold to allow a certain amount of flexibility or play so that the asbestos rings 20 may be compressed as the mold sections come together, whereby the core B is centered concentrically in said prevent seepage longitudinally of the core of entering the moldinwardly j of the molten metal mold sections in closed position, molten metal may be poured into said mold through the pouringgates 7 and'a pipe or other like article cast therefrom. Whenthe-mold is poured; the heat or the molten metal causes the coating of sand to dis irtegrate so-that the core, spindle 16' may be readily withdrawn from the mold. g

When the castingoperation: is completed and the clamps or locking-,means '6 are released to permit separation or opening of themold sections, the cope section 1 of theflask may be swung with theaid of the counterweight I5 to the: position shown in dottedlines in Fig. 3, and the cast pipe removed therefrom. It should be particularly undemtood that a pipe or similar article cast in apparatus of the character set forth need not be subsequently cleaned imarumbler or other device in the customarymanner as. the'use of a metal moldand thenovel construction of the vents in the latter ancFthe core spindlelSallow immediate ditmsion: of accumulated gases during the casting operation, and a perfect casting maybe produced. when: the nnished'casting has beenremoved from the mold, another core may be inserted and concentrically positioned within the mold by rings 20 for successive casting operations to be performed in substantially the, same manner. I

While a specific form of the invention is set forth and disclosed for the purpose of description, it is not intended that the invention be limited thereto, but that certain modifications and changes. inthe detail structure thereof may be incorporated within the scope of the annexed claims. I

'What is claimed is:

1-. In apparatusfor molding tubular articles, a permanent'mold, a core extending through said mold, and compressible heat resisting means \mounted in the mold adjacent its ends to support said core concentrically within said mold.

2,- In'apparatus for molding tubular articles, a

, permanent mold, a core extending through said mold, and asbestos rings mounted in the mold adiacent its was to support said core concentrically within said mold;

grooves to support said core concentrically with 155 saidmold; i i

'4.'In. apparatus for molding tubular articles, the combination .With a permanent mold having grooves formed in the'inner' surface thereof adjacent its ends, beyond themold cavity; a core ex- 1 1k EDWARD F. STRA'ITON'. 1

I no 

